Malicious PDF — malware analysis report

Static analysis result for SHA-256 e120392f81fc8251…

MALICIOUS

PDF

55.2 KB Created: 2021-05-16 16:13:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f7f88456c59d90d02e1c423112cb78b9 SHA-1: 9aeb6b9cebeb282fc0ebab276dcd8b89b28a80aa SHA-256: e120392f81fc8251f39caf5c1752c562c55c63b4cc1c6cd2e17f8c6be447f59a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and SEO-optimized PDF files, indicating a lure for users seeking free game items or hacks. The primary redirector URL is https://netcdn.xyz/app/406889139/moonactive-coin-master-free-spins-link-game-hack, which is associated with malicious activity. The document body, though heavily obfuscated, contains references to 'game hack' and 'free spins', reinforcing the lure. No scripts were extracted, but the embedded links and the nature of the lures strongly suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8324

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/406889139/moonactive-coin-master-free-spins-link-game-hack In PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/coin-master-tiradas-gratis-2021_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/play-games-for-robux_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a34.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A34 27252 bytes
SHA-256: 103842cc6f6b8cbb32b6cae66e8118130f111cf7b3617b12e0f19d0f2b4f7ce5
font_01_sfnt_off00008949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8949 3088 bytes
SHA-256: e7854aff7cbc8fbdeb85d2b3d6248d12dc820ede8a581f4eac107fa6446c2222
font_02_sfnt_off00009414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9414 7960 bytes
SHA-256: cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2
font_03_sfnt_off0000a73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA73A 18168 bytes
SHA-256: 5140a57a6990af64b86c6fc328de463115c3f290c56e1373822c3feaa5dc4a97
font_04_sfnt_off0000c8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E9 4272 bytes
SHA-256: fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0